[NSString rangeOfCharacterFromSet]
Finds and returns the range in the receiver of the first character from a given character set.
- (NSRange)rangeOfCharacterFromSet:(NSCharacterSet *)aSet
Parameters
- aSet
- A character set. This value must not be
nil.
Return Value of [NSString rangeOfCharacterFromSet]
The range in the receiver of the first character found from aSet. Returns a range of
{NSNotFound, 0} if none of the characters in aSet are found.Discussion of [NSString rangeOfCharacterFromSet]
Invokes
rangeOfCharacterFromSet:options: with no options.
This method detects all invalid ranges (including those with negative lengths). For applications linked against OS X v10.6 and later, this error causes an exception; for applications linked against earlier releases, this error causes a warning, which is displayed just once per application execution.
Example of [NSString rangeOfCharacterFromSet]
NSCharacterSet* notDigits = [[NSCharacterSet decimalDigitCharacterSet] invertedSet];
if ([newString rangeOfCharacterFromSet:notDigits].location == NSNotFound)
{
// newString consists only of the digits 0 through 9
}
Example of [NSString rangeOfCharacterFromSet]
NSCharacterSet * set = [[NSCharacterSet characterSetWithCharactersInString:@"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLKMNOPQRSTUVWXYZ0123456789"] invertedSet];
if ([aString rangeOfCharacterFromSet:set].location != NSNotFound) {
NSLog(@"This string contains illegal characters");
}
Example of [NSString rangeOfCharacterFromSet]
NSString *string = <your string>;
NSString *specialCharacterString = @"!~`@#$%^&*-+();:={}[],.<>?\\/\"\'";
NSCharacterSet *specialCharacterSet = [NSCharacterSet
characterSetWithCharactersInString:specialCharacterString];
if ([string.lowercaseString rangeOfCharacterFromSet:specialCharacterSet].length) {
NSLog(@"contains special characters");
}